<h1>Questions in the questionnaire</h1>

<p><b><u> How hard should have questions?</u></b></p>

<p>The difficulty of a question, in an objective, would be defined by the ratio
   of students that are right, which is calculated with values ​​from 0 to 1.</p>

<p>So, a good question for all students would be considered extremely easy
   (Give it a value of 1) and neither knew the other would answer a difficulty level
   excessive (give a value of 0).</p>

<p>In both cases, what we are interested is to emphasize that there is no discrimination level
   knowledge. If all are right or all fail a question, it does not give us information
   about the level of learning that takes each student.</p>

<p>The difficulty of the test as a whole would be determined by the difficulty of their
   parts (questions or items), and it is the teacher who must establish a priori that
   difficulty, ie what level domain will require its students. Example:
   <ul> An examination of <i>Introduction to Quantum Physics</i> should be as reliable and valid as another
   <i>Advanced Quantum Physics</i>, however should differ considerably in the
      difficulty of the questions (assuming that the students themselves to). </ul></p>

<p>Having decided the level of demand, the next step would be to select
   commensurate with that level questions, and book a small proportion of difficult items
   both minor and major.</p>

<p>With this, we would get not only whether or not the student meets certain minimum, but estimate
   more precisely of their degree of knowledge, learning of the subject.</p>

<p>Thus, the brightest highlight major difficulty hitting questions while
   major deficiencies will be reflected by the simplest items.
   This is what we mean when we talked about discrimination to distinguish criterion
   different grades.</p>

<p>Psychometry various indicators have been proposed also for the ability of
   item discrimination: we will work with the discrimination index (DI)
   whose values ​​range from +1 (perfectly discriminates item) to -1 (the item confuses
   the evaluator: the worst prepared what it right, and vice versa).</p>

<p><a href="help.php?file=quizdifficultyexrec.html&amp;module=quiz">Question</a></p>
